Aggregate dividends paid during the period for each share of common stock outstanding.

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Stockholders' Equity - Additional Information (Detail) - USD ($)					1 Months Ended	6 Months Ended
	Jun. 17, 2015	May. 07, 2015	Mar. 25, 2015	Feb. 19, 2015	Feb. 28, 2015	Jun. 30, 2015	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash dividend declaration per share		$ 1.69		$ 1.69
Dividends payable, date of Record		May 27, 2015		Mar. 11, 2015
Distribution, payment date		Jun. 17, 2015		Mar. 25, 2015
Total cash dividend paid	$ 96,203,000		$ 96,196,000
Stock, shares issued					586,646
Equity awards subject to vesting provisions, weighted-average grant date fair value					$ 222.40
Equity awards subject to vesting provisions, weighted-average requisite service period, in years					3 years 5 months 9 days
Installment first quarter of fiscal year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends declared date						Feb. 19, 2015
Installment second quarter of fiscal year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends declared date						May 07, 2015
Restricted stock units [Member] \| Installment first quarter of fiscal year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends payable							$ 2,630,000
Restricted stock units [Member] \| Installment second quarter of fiscal year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends payable						$ 2,443,000